English Views: 3467 Author: Phoenix Publish Time: 2023-02-20 Origin: Phoenix Breeding
Summer is here, and as the outside temperature gradually rises, the layer husbandry house can no longer achieve effective cooling only by relying on the longitudinal ventilation system. The high temperature in the house can easily lead to a decrease in the egg production rate of the flock, a reduction in egg weight, thinning of the eggshell, and even death from the heat stroke. At this time, how to scientifically and rationally use the ventilation &cooling system to reduce the heat stress of the chickens and ensure the stable egg production of the chickens in summer becomes particularly important.
1. Appropriate area of cooling pads
The formula for calculating the suitable area of the cooling pads is: the total ventilation volume of the fan in the shed / the suitable wind speed for passing the cooling pads.
Taking the stock of 16,500 chickens, the average weight of chickens is 1.8kg per chicken, and the layer house that is going to be installed with a 15cm thickcooling pads as an example: the oxygen demand of chickens per hour is 7~9m3/h/kg the wind speed is 1.5~2.0m/s, the total ventilation volume of the fans in the house is 16500 x 1.8 kg/ x 8m3/h/kg = 66m3/s, and the suitable installation area of the cooling pads is 66 m 3 /s /1.7 m/ s=39m2.
2. Installation position of cooling pads
The appropriate cooling curtain installation location should be selected according to the structural requirements of the chicken house. For a chicken house with a length of less than 100 meters, it is generally recommended installing it on the front gable of the chicken house. It should be more than 3 meters away from the chicken flock.
3. Cooling pads supporting facilities
Install a wet curtain deflector at the air outlet of the cooling pads inside the chicken house to ensure that the cold air entering the chicken house through the cooling pads is deflected by the deflector and then pushed to the middle and rear of the chicken house to avoid the temperature at the front of the chicken house during the start of the cooling pads if it is too low, increase the cooling area in the middle and rear of the chicken house, and reduce the temperature difference between the front and back of the chicken house.
4. cooling pads start temperature setting
According to the outside temperature and humidity in summer, summer weather can be divided into three types:
when the outside temperature is >32°c and the humidity is <50%, it is high temperature and low humidity weather.
In high temperature and low humidity weather, the start-up temperature of the cooling pads gradual transitions from 32°c to 30°C. After the chickens adapt, it stabilizes at 30°C. It is used from 9:00 am to 6:00 pm, and one-third of the total area of the cooling pads is soaked. The wind speed in the house reaches above 2 s/m, the wet curtain deflector is opened at 70 degrees, and the small ventilation window is opened at 3-5 cm. At this time, the chicken group feels a temperature of 21-22°c.
When the temperature is >32°c and the humidity is between 50% and 80%, it is high temperature and medium humidity weather.
In high-temperature and medium-humidity weather, the starting temperature of the cooling pads is 29°c, and it is used from 8 am to 8 pm. The cooling pads are set to open for 1 minute and then closed for 3-5 minutes. The wind speed in the house reaches above 2s/m. The flow plate is opened at 70 degrees, and the small ventilation windows are all closed. At this time, the chicken group feels a temperature of 21-22°c.
When the temperature is >32°c and the humidity is >80%, it is high-temperature and high-humidity weather.
In high-temperature and high-humidity weather, the starting temperature of the cooling pads gradual transitions from 32°c to 28°c, and it is used from 7:00 a.m. to 11:00 p.m. The cooling pads can always be activated according to the temperature, and the wind speed in the house reaches above 2s/m. The wet curtain deflector is opened at 70 degrees, and the small ventilation windows are all closed. At this time, the chicken group feels a temperature of 21-24°C.
5. Matters needing attention in the use of cooling pads
1). The cooling pads needs to be rinsed before use to ensure the permeability of the cooling pads. If there are an abnormal increase in the negative pressure in the house during use, and the wetted area of the cooling pads is uneven, it means that the cooling pads are blocked, and it needs to be timely cleaning.
2). If the wetted area of the cooling pads is too large due to misoperation, it is necessary to immediately reduce the number of fans to be turned on.
3). Set the opening temperature of the cooling pads on the temperature controller, and use dual control of temperature and time to avoid manual operation.
4). Judging whether the cooling pads setting are reasonable or not based on the temperature in the house, the temperature difference between front and back, the production index of the flock, the health status of the front-end flock, the behavior of the rear-end flock and the symptoms of autopsy.
It is generally required that the temperature at the front end should not be lower than 26°c, and the temperature difference between the front and back should not exceed 3°C;if the temperature at the front end is too low, the flock will experience diarrhea;
If the temperature at the back end is too high, the chickens will open their mouths and pant. The symptoms of autopsy are mainly pericarditis, pericardial effusion, lung foam congestion, yolk peritonitis and air sacculitis.
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